mpich devel 3.2a2

Closes #34243.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
mpich2: add 3.1.3 bottle.
mpich: update options

Remove "disable-shared" option. The circumstances that led to its
existence are no longer relevant. The current formula builds both
shared and static libraries, which is the norm in Homebrew.